Fedex pathetic service and query turnaround time

I would like to express my disappointment in the service my company has received from Fedex. I use Fedex for all my international deliveries. I always had one issue with their system as in that if their driver should arrive at the given delivery address and no one is home or at the office to accept the parcel, they then leave it at the front door and take a photo and this is then meant to be a POD. This method has now failed us big time, so much so that I am now about to lose my client. A parcel was supposedly left at the front door on 6 July 2023 but no pic was taken, no signature was received and my client is still without the parcel and its now 21 August 2023. We are struggling to understand why their log sheet cant see who delivered the parcel and to do a thorough search. I have logged this enquiry with Fedex about a week ago and still no response. This incident has seriously impacted my business.